64181 has 4 divisors (see below), whose sum is σ = 69132. Its totient is φ = 59232.

The previous prime is 64171. The next prime is 64187. The reversal of 64181 is 18146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17956 + 46225 = 134^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 64181 - 2¹⁴ = 47797 is a prime.

It is a super-2 number, since 2×64181² = 8238401522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64181.

It is not an unprimeable number, because it can be changed into a prime (64187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2456 + ... + 2481.

It is an arithmetic number, because the mean of its divisors is an integer number (17283).

2⁶⁴¹⁸¹ is an apocalyptic number.

It is an amenable number.

64181 is a deficient number, since it is larger than the sum of its proper divisors (4951).

64181 is a wasteful number, since it uses less digits than its factorization.

64181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950.

The product of its digits is 192, while the sum is 20.

The square root of 64181 is about 253.3396929026. The cubic root of 64181 is about 40.0376728411.

The spelling of 64181 in words is "sixty-four thousand, one hundred eighty-one".